Allows url with id to work in chargeback rates explorer

This commit will allow direct url with id of rate to work in chargeback rates explorer
- http://localhost:3000/chargeback_rate/explorer/ (loads Rates explorer)
- http://localhost:3000/chargeback_rate/x_show/9  (loads summary screen of rate using id passed in the url)

Partially fixes #6996

app/controllers/chargeback_rate_controller.rb

@@ -25,21 +25,22 @@ def x_show
     params[:id] = "xx-#{@record.rate_type}_#{nodeid}"
     params[:tree] = x_active_tree.to_s
     tree_select
+    redirect_to :action => 'explorer' unless request.xml_http_request? # Ajax request means in explorer
   end
 
   def tree_select
-    self.x_active_tree = params[:tree] if params[:tree]
+    self.x_active_tree = :cb_rates_tree
     self.x_node = params[:id]
     get_node_info(x_node)
-    replace_right_cell
+    replace_right_cell if request.xml_http_request? # Ajax request means in explorer
   end
 
   def explorer
     @breadcrumbs = []
     @explorer    = true
     build_accordions_and_trees
 
-    @right_cell_text = _("All Chargeback Rates")
+    @right_cell_text ||= _("All Chargeback Rates")
     set_form_locals if @in_a_form
     session[:changed] = false
 

app/views/chargeback_rate/x_show.html.haml

@@ -0,0 +1 @@
+= render :partial => 'cb_rate_show'

config/routes.rb

@@ -369,6 +369,7 @@
     :chargeback_rate => {
       :get  => %w(
         explorer
+        x_show
       ),
       :post => %w(
         explorer